Hide mouse pointer in Fortnite?

I have played Fortnite on my PC since I got my new PC. Since then I have had the problem that the mouse pointer is displayed and some controller inputs are blocked! Has anyone ever had the problem? Or can someone help me there?

You shouldn't be able to see it in full screen mode

The mouse pointer is still showing, just tried it. But that's really weird because I downloaded the latest Fortnite update this morning and I've had the problem since then, everything went fine before!